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Hmm I can’t see the image for some reason, but all the levels are solvable without guessing.

Here’s my playthrough of level 30, if it helps: https://youtu.be/giioFijaOoM?t=6129 (I think the main thing is knowing to put the X in column 9 row 3)

I'm pretty sure level 30 is uniquely solvable. Have you found a valid solution other than the one below?

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I managed to solve it just now without guessing.

For me 72 and 89 were really difficult.